qcacmn: fix out of bound access of memories in wlan_cfg80211_scan

In wlan_cfg80211_scan the number of ssid, ssid length and number of
channels are not checked for max size of array and thus can lead to
Out of bound access of memories.

Fix is to add bound check before copying the params.

Change-Id: Ie6d4e546fb9c884d5988493b611ef7b217f0a95c
CRs-Fixed: 2375217